Beau's Lines

The document reports a case of Beau's lines, which are transverse grooves on the nail surface, in a 75-year-old woman with a history of psoriasis, specifically during an episode of extensive pustular psoriasis. The patient also experienced telogen effluvium, a condition characterized by diffuse hair shedding, which occurred simultaneously with the Beau's lines. The case suggests that both Beau's lines and telogen effluvium may be caused by the temporary arrest of matrix cell function after severe metabolic stress, and although no previous association between the two conditions had been reported in dermatologic literature, their concurrent appearance in this patient was not considered unexpected due to the nature of the underlying stressors. The patient's pustular psoriasis was treated conservatively, and within ten weeks, the psoriasis had cleared, but the Beau's lines and hair loss were noted. The document emphasizes that both Beau's lines and telogen effluvium can result from severe systemic stress, and their occurrence together in this patient highlights a potential link between nail and hair matrix disturbances.